# A method for designing birdcage coils based on a simplified magnetic field model, validated experimentally at 4 T, 7 T, and 15.2 T

## TL;DR

This paper introduces a new theoretical model for birdcage coils in MRI, validated experimentally to improve image quality and coil design.

## Contribution

A simplified magnetic field model for birdcage coils is proposed and experimentally validated at multiple magnetic field strengths.

## Key findings

- The model accurately predicts the magnetic field behavior of birdcage coils at 4 T, 7 T, and 15.2 T.
- Phantom image results align with experimental data, confirming the model's effectiveness.
- The model provides a framework for optimizing RF coil performance in MRI and MRS.

## Abstract

Magnetic resonance imaging and spectroscopy rely on magnetic fields generated by radiofrequency (RF) volume coils for high-quality data acquisition. Understanding electromagnetic field behavior in these coils is key to optimizing imaging and designing advanced coils. This paper presents an alternative tool to validate experimental and simulated results from traditional bridge coils using a theoretical approach to derive the magnetic field B1 expression for a BC coil. The formula will be used for: (a) assessing RF coil performance for high-quality images with optimal SNR and accurate anatomical representation, and (b) guiding the development of BC coils for specific applications. To validate the model, phantom images were acquired at different resonant frequencies, and the results were compared with experimental data. The findings confirm the accuracy and effectiveness of the model, offering insights into electromagnetic field behavior and providing a framework for advancing RF coil design in MR imaging and MR spectroscopy.

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